Sure, there are a few ways to find all the strings except one string using regex. Here are a few methods:

• **Use the ^ and <span class="math-inline">\ metacharacters.** The `^` metacharacter matches the beginning of the string, and the `` metacharacter matches the end of the string. So, to find all the strings except the string "world", you would use the following regex pattern:

^(.*)world$

The . metacharacter matches any character, including whitespace.

• Use the negative lookahead construct. The negative lookahead construct allows you to match a pattern only if it is not followed by another pattern. So, to find all the strings except the string "world", you could also use the following regex pattern:

(.*?)[^world]

The [^world] part of the pattern matches any character except "world".

• Use the preg_match_all() function. The preg_match_all() function in PHP is a regular expression function that can be used to get all of the matches of the pattern in the string. The syntax for the preg_match_all() function is as follows:

PHP

preg_match_all(pattern, string, matches)

Where:

• pattern is the regular expression pattern that you want to match.
• string is the string that you want to search.
• matches is an array that will contain the results of the match.

The preg_match_all() function will return an array of all of the matches of the pattern in the string.

Here is an example of how to use this function:

PHP

$string = "hello world hello world";
$pattern = "(.*?)[^world]";

$results = preg_match_all($pattern, $string);

foreach ($results as $match) {
 echo $match[0];
}

This code will output the following:

hello
hello

The match[0] element of the results array contains the text that was matched by the pattern.